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Real Estate Investments - Acquisitions (Textual) (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) ft² a | Mar. 22, 2018 USD ($) a | Jan. 05, 2018 USD ($) ft² | Jun. 30, 2018 USD ($) ft² | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) ft² | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Prepaid leasehold interests in land held for development | [1] |  |  |  | $ 40,177 |  | $ 40,177 |  | $ 0
Capitalized transaction costs |  |  |  |  |  |  | $ 7,938 | $ 9,846 |
Area of real estate property | ft² |  |  |  |  | 16,462,764 |  | 16,462,764 |  |
Net income (loss) |  |  |  |  | $ 13,006 | $ 7,653 | $ 57,335 | $ 28,755 |
Seven Tower Bridge [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Sale of ownership interest percentage |  |  |  | 20.00% |  |  |  |  |
3025 JFK Boulevard [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Lease agreement term |  | 99 years |  |  |  |  |  |  |
Area of developed parcels of land (in acres) | a |  | 1 |  |  |  |  |  |  |
Prepaid leasehold interests in land held for development |  | $ 15,000 |  |  |  |  |  |  |
Capitalized transaction costs |  | 300 |  |  |  |  |  |  |
3025 JFK Boulevard [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Leasehold valuation credit |  | 5,600 |  |  |  |  |  |  |
3001-3003 and 3025 JFK Boulevard [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Lease agreement term |  |  |  |  |  |  | 99 years |  |
Leasehold valuation credit applied to development |  | $ 2,400 |  |  |  |  |  |  |
Minimum floor area ratio required for realization of credit | ft² |  | 1,200,000 |  |  |  |  |  |  |
Remaining leasehold valuation credit |  | $ 3,200 |  |  |  |  |  |  |
Reimbursable leasehold valuation credit |  | $ 3,200 |  |  |  |  |  |  |
3001-3003 JFK Boulevard [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Lease agreement term |  |  | 99 years |  |  |  |  |  |
Area of developed parcels of land (in acres) | a |  |  | 1 |  |  |  |  |  |
Prepaid leasehold interests in land held for development |  |  | $ 24,600 |  |  |  |  |  |
Capitalized transaction costs |  |  | 300 |  |  |  |  |  |
3001-3003 JFK Boulevard [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Prepaid leasehold interests in land held for development |  |  | $ 24,900 |  |  |  |  |  |
Four Tower Bridge [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 35.00% |  |  |  |  |
Percentage of ownership interest after non-monetary exchange transaction |  |  |  | 100.00% |  |  |  |  |
Capitalized transaction costs |  |  |  | $ 100 |  |  |  |  |
Fair value of unencumbered acquisition related costs, to tangible and intangible assets and liabilities |  |  |  | $ 23,696 |  |  |  |  |
Service and other revenue |  |  |  |  | 700 |  | $ 1,400 |  |
Net income (loss) |  |  |  |  | $ (100) |  | $ 100 |  |
Four Tower Bridge [Member] | Conshohocken [Member] | Pennsylvania [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  | 86,021 |  |  |  |  |
Real estate property debt |  |  |  | $ 9,700 |  |  |  |  |
[1] | As of June 30, 2018, this caption comprised leasehold interests in prepaid 99-year ground leases at 3025 and 3001-3003 JFK Boulevard, in Philadelphia, Pennsylvania. See Note 3, “Real Estate Investments,” for further information

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